n.
Pronunciation: ' dü-t ə -r ō - ˌ st ō m also ' dyü-
Function: noun
Etymology: New Latin Deuterostomia, group name, from deuter- + Greek stoma mouth ― more at STOMACH
Date: 1950
: any of a major division (Deuterostomia) of the animal kingdom that includes the bilaterally symmetrical animals (as the chordates) with indeterminate cleavage and a mouth that does not arise from the blastopore